Abdullaah ibn Haarith [PBUH] said: “I never came across a person who smiled as much as Prophet Muhammad [PBUH]. Prophet Muhammad [PBUH] regarded smiling to a brother as an act of charity.”
“TO UR BROTHER” = THE USE OF “BROTHER” IS EQUIVALENT TO THE USE OF ‘HE/HIM/HIS’ THAT IN GENERAL CAN BE USED TO REFER BOTH GENDERS
BUT OF COURSE, IN ISLAM, BROTHERS TOWARDS BROTHERS AND SISTERS TOWARDS SISTERS.
A SMILE IS A REALLY POWERFUL TOOL, USE IT ONLY TO GAIN MORE OF ALLAH’S RECOGNITION THAN JUST TO SATISFY HUMANS :)))))